diff --git a/moneymgr_backend/src/services/movements_service.rs b/moneymgr_backend/src/services/movements_service.rs
index f24d940..f7c678d 100644
--- a/moneymgr_backend/src/services/movements_service.rs
+++ b/moneymgr_backend/src/services/movements_service.rs
@@ -44,7 +44,15 @@ impl UpdateMovementQuery {
             }
         }
 
-        // TODO : check for conflict
+        // Check for conflict with other movements
+        if let Ok(_) =
+            get_by_account_label_amount_time(self.account_id, &self.label, self.amount, self.time)
+                .await
+        {
+            return Ok(Some(
+                "A movement taken at the same time with the same label and the same amount already exists!",
+            ));
+        }
 
         Ok(None)
     }
@@ -87,3 +95,28 @@ pub async fn update(id: MovementID, q: &UpdateMovementQuery) -> anyhow::Result<(
 
     Ok(())
 }
+
+/// Get a single movement by its id
+pub async fn get_by_id(movement_id: MovementID) -> anyhow::Result<Movement> {
+    Ok(movements::table
+        .filter(movements::dsl::id.eq(movement_id.0))
+        .get_result(&mut db()?)?)
+}
+
+/// Get a single movement by account_id, label, amount and time
+pub async fn get_by_account_label_amount_time(
+    account_id: AccountID,
+    label: &str,
+    amount: f32,
+    time: u64,
+) -> anyhow::Result<Movement> {
+    Ok(movements::table
+        .filter(
+            movements::dsl::account_id
+                .eq(account_id.0)
+                .and(movements::dsl::label.eq(label))
+                .and(movements::dsl::amount.eq(amount))
+                .and(movements::dsl::time.eq(time as i64)),
+        )
+        .get_result(&mut db()?)?)
+}